Lol this isn't poly bruh. It's sex partners.
from what i can see, im pretty sure this might be an open ending
That doesn't mean a relationship for 3 people. There's OPEN relationships, there's poly, there's only playing with a 3rd together, the options aren't limited to something like poly. They're currently 3 sex partners. Even if redhead gets with dark haired subby, they wouldn't be "poly", I think you're mistaking poly to mean dating multiple people. She's not interested in dating everyone she plays with.
ohh… sex partners
but. yes theres a but, theres always a chance that at least one of them is going to get hurt.